import React, {Component} from 'react';

class App extends Component {

    render() {
        const obj = {
            backgroundColor: 'black',
            color: 'white',
            fontSize: '12px'
        }
        const name = '张三'
        return (
            <div>
                {20 + 20} - {name}
                <div style={obj}>你好大佬</div>
            </div>
        );
    }
}

export default App;